Process for manufacturing tubular products of cellulose or compounds of cellulose



L. HESSE.

PROCESS FOR MANUFACTURING TUBULAR PRODUCTS 0F CELLULOSE 0R COMPOUNDS 0FCELLULOS APPLlC'ATlON FILED JUNE 21, I916. RENEWED FEB. s, 1920.

1,341,745. Patented June 1, 1920.

INVENLO I 005d 40' BY 6 Q @M 5 M E ATTORNEYS LEOIOLD :anssn, onOBERBRUCI-I, NEAR. AACHEN, GERMANY, ASSIGNOR 6 vnnnrmernGLANZSTOFF-FABRIKEN A.CG., or ELBERFEL'D, GERMANY.

PROCESS FOR MANUFACTURING TUBULAR PRODUCTS OF CELLULOSE OR COMPOUNDS OFCELLULOSE.

Specification of Letters Patent.

Application filed June 21, 1916, Serial No. 105,058. Renewed February 5,1920. Serial No. 356,419.

To all whom it may concern:

Be it known that I, LEOPOLD HESSE, a

subject of the German Empire, residing at Oberbruch, near the cityofinvented a certain new and useful Process for Manufacturing TubularProducts of Cellulose or Compounds of Cellulose; and I do hereby declarethe following to be a full,

clear, and exact description of my invention.

My invention relates to a process of manuess. The product shows theoptical effect of layers of thin transparent lamellas pressed together.This effectvaries with the thickness and form of the ribbons, therelative position of them, and the tension in the spirals. I

The thickness of the ribbons depends upon the width of the slits,theconstitution of the cellulose-solution and the stretching during thespinning process, the latter and the properties of the precipitatingbath being essential for the tension in the dry material. .The slits maybe of any suitable form, they 'may be straight, curved or indented. Theribbons may also be twisted several together.

For spinning I use a so-called spinning pot or a spinning centrifuge. Byvarying the sort of solution of cellulose, by using slits of differentwidth and shape, by changing the quality of the precipitating bath andthe manner of spinning, influencing the shrinkage and tension in thefinished fabric, I can produce fabrics of different appearance, whichare to be used as substitutes for straw, hemp, tagal-fiber, etc., havingthe advantage of being endless.

Aachen, Kingdom of Prussia, Empire of Germany, have Patented June 1,i920.

' The process resembles the method for producing jute, in which paper,out to strips, is rolled up in spirals and twisted to tubular products.The paper strips may also be replaced by finished strips of cellulosefilms WhlOll may be rolled up in endless spirals. but the obtainablefabrics are far inferior to the products which I obtain by my wetspinning process in a more economical way.

For finishing the fabrics I treat them in the same way as the fabrics ofartificial silk, by washing out the precipitating chemicals and dryingunder tension.

The feature of my invenion is the produc-.

tion of fabrics of great softness, with separated heat isolating spacesin the interior of the product.

An apparatus which may be used in producing the tubular threads isillustrated in the accompanying drawing, wherein Figure 1 1s a somewhatdiagrammatic view of-the apparatus, and Fig. 2 is a View of the spinningnozzle and showing the character of the projected and spirally twistedfilament.

Insaid drawings, A designates a spinning nozzle having a long narrowslit a therein from which the cellulose solution is projected in a broadthin strip or ribbon and precipitated in the bath B.- Preferably theprecipitated strip of cellulose, while still plastic, is led over a roll0 to a rotating spinning pot (1 having feed rolls 0, the cellulose stripbeing wound into hollow spiral form between the roll a and rolls 0', andcoiled 1n the bottom of the pot A rack and gear 0 turns the feed rolls0.

\Vhat I claim is:

A process for manufacturing tubular cords of cellulose orcellulose-compounds, consisting in ejecting solutions of cellulose orcellulose compounds through elongated spinning slits into precipitatingbaths and rolling up the resulting ribbons or strips into endlessspirals by spinning or twisting, substantially as set forth.

In testimony that I claim the foregoing as my invention, 1 have signedmy name in presence of two subscribing witnesses.

HENRY C. A. DAMM, HENRY CUADFLIEG.

